The 32-bit ARM version of uLisp 2.3 now includes support for floating point, in addition to the 32-bit integers supported in previous versions. Programs using integers will work exactly as in previous versions, and there should be no noticeable change in performance. For more information see Floating-point features.
Both the ARM and AVR versions of uLisp also include a new Lisp Library feature, which allows you to compile uLisp with your own Lisp extensions. For more information see Lisp Library.